BTX loader crash on AM2 Asus M2N32 WS mainboard

The BTX loader crashes on a brand new AM2 Asus M2N32 WS Professional mainboard
with nForce790 SLI chipset.  The CPU is AMD Athlon 64 X2 4800+.  The system has
got an Areca ARC-1220 8-port PCI-E SATA2 RAID controller, a Intel PCI-X Pro/1000MT
NIC and an ATI RV370 based graphics card (Asus EAX1050&TD/256M, PCI-E).  RAM is
upped to 8GB in 4 times 2GB of Kingston KVR667D2N5/2G (DDR2-667, CL5).

BIOS is updated to the newest revision.  I've tried the boot CD's for FreeBSD
6.2R i386, 7.0BETA3 i386 and 7.0BETA3 amd64.  All crash in the same place.  With
only 4GB it still crashes in the same place.

Transscript of BTX crash dump:

int=0000000d  err=00000000  efl=00030046  eip=00001288
eax=00000000  ebx=0000ffff  ecx=ffffffff  edx=fdbff310
esi=000033da  edi=00003826  ebp=00005eac  esp=00005e9a
ca=d000  ds=9980  es=0000    fs=975a  gs=0000  ss=9980
cs:eip=... (see image)
ss:esp=... (see image)
BTX halted

Orignal image of crash dump:

  http://www.networx.ch/btx%20loader%20crash.jpg


Any suggestions and help appreciated.

-- 
Andre